CN105891632B - A kind of sychronizing signal detecting method based on step low-pass trapper - Google Patents
A kind of sychronizing signal detecting method based on step low-pass trapper Download PDFInfo
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- CN105891632B CN105891632B CN201610213293.0A CN201610213293A CN105891632B CN 105891632 B CN105891632 B CN 105891632B CN 201610213293 A CN201610213293 A CN 201610213293A CN 105891632 B CN105891632 B CN 105891632B
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Abstract
The invention discloses a kind of sychronizing signal detecting methods based on step low-pass trapper.First, increasing to noise alleviation speed to greatly improve system cut-off frequency using based on second order filter and trapper, reducing detection phase shift and improving system dynamic responding speed.Second is that reference frequency and filter parameter are dynamically adjusted by SOGI-PLL, to meet the testing requirements to mains frequency wide variation.Compared with existing phase synchronization signal detection technique, new method greatly simplifies in structure and parameter design, and theoretical and experiment shows that sychronizing signal detecting method of the present invention has satisfied accuracy of detection and dynamic response under the various operating modes of power grid.
Description
Technical field
The present invention relates to a kind of sychronizing signal detecting methods, and in particular to a kind of synchronous letter based on step low-pass trapper
Number detection method.
Background technology
In recent years using photovoltaic, wind energy as the development of the new energy of representative so that the application of gird-connected inverter is more and more extensive.
Synchronized signal how is accurately and rapidly obtained to realize high power, high quality for gird-connected inverter and stablize grid-connected to pass
It is important.The bad working environments of power grid include mainly voltage magnitude mutation, SPA sudden phase anomalies, frequency discontinuity and harmonic wave.Electricity is obtained at present
Net synchronizing signal algorithm includes mainly open loop and closed loop two major classes.What open loop synchronization detection algorithm was used more is to be based on static two
The synchronization signal detection technology of phase coordinates, simple in structure, response quickly.But construction orthogonal method time delay, precision or
All existing defects need additional link to carry out correcting process in terms of anti-interference.Another important problem of this kind of algorithm is exactly such as
What anti-interference sex chromosome mosaicism of the enhancing algorithm in non-ideal power grid.It needs to design suitable filter in power grid in the case of containing higher hamonic wave
Wave device decouples fundamental wave and higher hamonic wave, increases system complexity.Phaselocked loop based on synchronous rotating frame
(synchronous rotatingframe PLL, SRF-PLL) is most common synchronization signal detection technology.Its essence is one
A phase closed-loop system, in grid conditions, ideally this method can accurately detect synchronizing signal, but in non-ideal item
It but needs to inhibit interference caused by being distorted by power grid by reducing filter bandwidht under part, influences the dynamic response of detection.
The present invention proposes the sychronizing signal detecting method based on step low-pass trapper.First, using second order filter is based on
Increase to noise alleviation speed to greatly improve system cut-off frequency with trapper, reduce detection phase shift and improves system
Dynamic responding speed.Second is that reference frequency and filter parameter are dynamically adjusted by SOGI-PLL, to meet to power grid frequency
The testing requirements of rate wide variation.Compared with existing phase synchronization signal detection technique, new method is set in structure and parameter
It is greatly simplified on meter, theoretical and experiment shows that sychronizing signal detecting method of the present invention has satisfied inspection under the various operating modes of power grid
Survey precision and dynamic response.
Invention content
Letter is synchronized based on step low-pass trapper in view of this, technical problem to be solved by the invention is to provide a kind of
Number detection method, to improve the precision and dynamic response of phase synchronization signal detection.
The purpose of the present invention is what is realized by following means.
A kind of sychronizing signal detecting method based on step low-pass trapper, includes the following steps：
1) mains voltage signal is acquired, the voltage of grid side is converted into lower voltage and through the AD conversion of control system
It is sent into DSP afterwards.
2) 1) gained network voltage u (t) is obtained the actual corners of network voltage by DSP by broad sense Second Order Integral-frequency locking ring
Frequencies omega0。
3) DSP by 2) gained network voltage actual angular frequency ω0It is generated through reference signal generator and refers to sinusoidal signal
sin(ω0t+φ0) and with reference to cosine signal cos (ω0t+φ0)。
4) 1) gained network voltage u (t) and 3) gained are referred to sinusoidal signal sin (ω by DSP0t+φ0) be multiplied, and through certainly
It adapts to step low-pass trapper and obtains first M signal U_sin '.
5) 1) gained network voltage u (t) and 3) gained are referred to cosine signal cos (ω by DSP0t+φ0) be multiplied, and through certainly
It adapts to step low-pass trapper and obtains second M signal U_cos '.
6) 3) gained is referred to sinusoidal signal sin (ω by DSP0t+φ0) be multiplied life with 4) gained first M signal U_sin '
At signal and 3) gained refer to cosine signal cos (ω0t+φ0) be multiplied generation with 5) gained second M signal U_cos '
Signal is added to obtain third M signal Ua。
7) 3) gained is referred to cosine signal cos (ω by DSP0t+φ0) be multiplied life with 4) gained first M signal U_sin '
At signal and 3) gained refer to sinusoidal signal sin (ω0t+φ0) be multiplied generation with 5) gained second M signal U_cos '
Signal subtraction obtains the 4th M signal Ub。
8) DSP is by 6) gained third M signal UaWith 7) the 4th M signal U of gainedbIt is squared and, then carry out evolution fortune
Calculation obtains power grid fundamental voltage amplitude signal A1。
9) DSP is by 6) gained third M signal UaWith 8) gained power grid fundamental voltage amplitude signal A1It is divided by obtain power grid fundamental wave
Synchronous sinusoidal signal sin (ω1t+φ0)。
10) DSP is by 7) gained third M signal UbWith 8) gained power grid fundamental voltage amplitude signal A1It is divided by obtain power grid fundamental wave
Synchronous cosine signal cos (ω1t+φ0)。
Further, the transmission function of the step low-pass trapper is expressed as：
Wherein, ωc, Q indicate respectively in step low-pass trapper the cutoff frequency of second-order low-pass filter component and quality because
Number, k, KsThe trap frequency points and trap intensity of second-order low-pass filter trap component in step low-pass trapper are indicated respectively
Coefficient.
The advantage of the invention is that：The present invention proposes the sychronizing signal detecting method based on step low-pass trapper.When
Increase to noise alleviation speed to greatly improve system cut-off frequency using based on second order filter and trapper, reduces
It detects phase shift and improves system dynamic responding speed.Second is that being joined dynamically to adjust reference frequency and filter by SOGI-PLL
Number, to meet the testing requirements to mains frequency wide variation.Compared with existing phase synchronization signal detection technique, newly
Method greatly simplifies in structure and parameter design, and theoretical and experiment shows that sychronizing signal detecting method of the present invention is various in power grid
There are satisfied accuracy of detection and dynamic response under operating mode.
Description of the drawings
Fig. 1 is detection method schematic diagram；
Fig. 2 is step low-pass trapper structure chart；
Fig. 3 is different KsStep low-pass trapper Bode diagram under coefficient；
Specific implementation mode
The present invention is described further with embodiment below in conjunction with the accompanying drawings：
1. basic principle
Sychronizing signal detecting method based on step low-pass trapper.First, increasing using based on second order filter and trapper
Add to noise alleviation speed to greatly improve system cut-off frequency, reduce detection phase shift and improves system dynamic response speed
Degree.Second is that dynamically adjusting reference frequency and filter parameter by SOGI-PLL, mains frequency is become on a large scale to meet
The testing requirements of change.Compared with existing phase synchronization signal detection technique, new method is significantly simple in structure and parameter design
Change, theoretical and experiment show that sychronizing signal detecting method of the present invention has satisfied accuracy of detection and moved under the various operating modes of power grid
State responds.
2. the process of realization
Referring to attached drawing 1, the sychronizing signal detecting method based on step low-pass trapper realizes that process includes following link：
1) mains voltage signal is acquired, the voltage of grid side is converted into lower voltage and through the AD conversion of control system
It is sent into DSP afterwards.
2) 1) gained network voltage u (t) is obtained the actual corners of network voltage by DSP by broad sense Second Order Integral-frequency locking ring
Frequencies omega0。
3) DSP by 2) gained network voltage actual angular frequency ω0It is generated through reference signal generator and refers to sinusoidal signal
sin(ω0t+φ0) and with reference to cosine signal cos (ω0t+φ0)。
4) 1) gained network voltage u (t) and 3) gained are referred to sinusoidal signal sin (ω by DSP0t+φ0) be multiplied, and through certainly
It adapts to step low-pass trapper and obtains first M signal U_sin '.
5) 1) gained network voltage u (t) and 3) gained are referred to cosine signal cos (ω by DSP0t+φ0) be multiplied, and through certainly
It adapts to step low-pass trapper and obtains second M signal U_cos '.
6) 3) gained is referred to sinusoidal signal sin (ω by DSP0t+φ0) be multiplied life with 4) gained first M signal U_sin '
At signal and 3) gained refer to cosine signal cos (ω0t+φ0) be multiplied generation with 5) gained second M signal U_cos '
Signal is added to obtain third M signal Ua。
7) 3) gained is referred to cosine signal cos (ω by DSP0t+φ0) be multiplied life with 4) gained first M signal U_sin '
At signal and 3) gained refer to sinusoidal signal sin (ω0t+φ0) be multiplied generation with 5) gained second M signal U_cos '
Signal subtraction obtains the 4th M signal Ub。
8) DSP is by 6) gained third M signal UaWith 7) the 4th M signal U of gainedbIt is squared and, then carry out evolution fortune
Calculation obtains power grid fundamental voltage amplitude signal A1。
9) DSP is by 6) gained third M signal UaWith 8) gained power grid fundamental voltage amplitude signal A1It is divided by obtain power grid fundamental wave
Synchronous sinusoidal signal sin (ω1t+φ0)。
10) DSP is by 7) gained third M signal UbWith 8) gained power grid fundamental voltage amplitude signal A1It is divided by obtain power grid fundamental wave
Synchronous cosine signal cos (ω1t+φ0)。
Referring to attached drawing 2, it can be seen that step low-pass trapper is other than with second-order low-pass filter characteristic, also in ω
Integral multiple at add trapper characteristic and carry out higher frequency component of greatly decaying, so as to which second-order low-pass filter is ended
Set of frequency obtains higher.Parameter KsFor adjusting trapper branch negative-feedback intensity,
Referring to attached drawing 3, it can be seen that work as KsTrap frequency point bandwidth is larger when larger, otherwise smaller.
Without departing from the spirit and scope of the present invention, those skilled in the art are without departing from the scope of the present invention
In the case of spirit, the various obvious modifications or variation about form and details carried out to it should all be fallen in this hair
Within bright protection domain.
Claims (3)
1. a kind of sychronizing signal detecting method based on step low-pass trapper, it is characterised in that：Include the following steps：
1) mains voltage signal is acquired, the voltage of grid side is converted into lower voltage and is sent after the AD conversion of control system
Enter in DSP；
2) 1) gained network voltage u (t) is obtained the actual angular frequency of network voltage by DSP by broad sense Second Order Integral-frequency locking ring
ω0；
3) DSP by 2) gained network voltage actual angular frequency ω0It is generated through reference signal generator and refers to sinusoidal signal sin
(ω0t+φ0) and with reference to cosine signal cos (ω0t+φ0)；
4) 1) gained network voltage u (t) and 3) gained are referred to sinusoidal signal sin (ω by DSP0t+φ0) be multiplied, and through adaptive
Step low-pass trapper obtains first M signal U_sin '；
5) 1) gained network voltage u (t) and 3) gained are referred to cosine signal cos (ω by DSP0t+φ0) be multiplied, and through adaptive
Step low-pass trapper obtains second M signal U_cos '；
6) 3) gained is referred to sinusoidal signal sin (ω by DSP0t+φ0) be multiplied generation with 4) gained first M signal U_sin '
Signal and 3) gained are with reference to cosine signal cos (ω0t+φ0) be multiplied the signal generated with 5) gained second M signal U_cos '
Addition obtains third M signal Ua；
7) 3) gained is referred to cosine signal cos (ω by DSP0t+φ0) be multiplied generation with 4) gained first M signal U_sin '
Signal and 3) gained are with reference to sinusoidal signal sin (ω0t+φ0) be multiplied the signal generated with 5) gained second M signal U_cos '
Subtract each other to obtain the 4th M signal Ub；
8) DSP is by 6) gained third M signal UaWith 7) the 4th M signal U of gainedbIt is squared and, then carry out extracting operation and obtain
To power grid fundamental voltage amplitude signal A1；
9) DSP is by 6) gained third M signal UaWith 8) gained power grid fundamental voltage amplitude signal A1It is divided by obtain the synchronization of power grid fundamental wave
Sinusoidal signal sin (ω1t+φ0)；
10) DSP is by 7) gained third M signal UbWith 8) gained power grid fundamental voltage amplitude signal A1It is divided by obtain the synchronization of power grid fundamental wave
Cosine signal cos (ω1t+φ0)。
2. a kind of sychronizing signal detecting method based on step low-pass trapper according to claim 1, it is characterised in that：
Filter, which is used, to be increased to noise alleviation speed based on second order filter and trapper to greatly improve system cutoff frequency
Rate reduces detection phase shift and improves system dynamic responding speed.
3. a kind of sychronizing signal detecting method based on step low-pass trapper according to claim 1, it is characterised in that：
The transmission function of the step low-pass trapper is expressed as：
Wherein, ωc, Q indicate the cutoff frequency and quality factor of second-order low-pass filter component in step low-pass trapper respectively, k,
KsThe trap frequency points and trap strength factor of second-order low-pass filter trap component in step low-pass trapper are indicated respectively.
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| CN107703358B (en) * | 2017-07-17 | 2019-11-22 | 西安理工大学 | A kind of phase locked algorithm based on improvement Second Order Generalized Integrator |
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